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In this lesson we talk about RF power amplifier chips

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The RF power amplifier is the power amplifier chip in the radio frequency circuit of the mobile phone,

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referred to as the RF power amplifier

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As we mentioned before,

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the radio frequency chip converts the digital signal of the mobile phone into an analog signal,

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but it is very weak and not enough to send to the base station,

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so there is generally a PA in the radio frequency chip,

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short for power amplifier

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A power amplifier used in a radio frequency circuit is a chip

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that can amplify electrical power

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In the picture on the right, the two chips we framed,

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this and this, are the RF power amplifier chips

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The power amplifier chip of Android mobile phone

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is generally on the side of the antenna port

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This is the antenna port, where the antenna is mounted,

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and the amplifier is right next to it

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There are hooks and forks on the surface of the power amplifier chip,

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or irregular fonts

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As you can see in the picture on the right,

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the symbol of the power amplifier is very irregular, like a fork

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There are two common power amplifiers in mobile phones,

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generally called main power amplifier and sub power amplifier

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The main power amplifier is also called a multi-module power amplifier

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The appearance is rectangular

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It is generally a 3G and 4G power amplifier

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The sub power amplifier is also called the antenna switch,

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or the RF front-end chip, which is square

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This is the main power amplifier,

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this is the sub power amplifier

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Okay, that's it for this lesson